netdev - [PATCH net-next] tcp: Remove use of inet6_sk and add IPv6 checks to tracepoint

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Message-Id: <1508339849-19527-1-git-send-email-dsahern@gmail.com>
Date:   Wed, 18 Oct 2017 08:17:29 -0700
From:   David Ahern <dsahern@...il.com>
To:     netdev@...r.kernel.org
Cc:     xiyou.wangcong@...il.com, eric.dumazet@...il.com,
        songliubraving@...com, davem@...emloft.net,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net-next] tcp: Remove use of inet6_sk and add IPv6 checks to tracepoint

386fd5da401d ("tcp: Check daddr_cache before use in tracepoint") was the
second version of the tracepoint fixup patch. This patch is the delta
between v2 and v3.  Specifically, remove the use of inet6_sk and check
sk_family as requested by Eric and add IS_ENABLED(CONFIG_IPV6) around
the use of sk_v6_rcv_saddr and sk_v6_daddr as done in sock_common (noted
by Cong).

Signed-off-by: David Ahern <dsahern@...il.com>
---
Eric/Congi/Song: I did not keep your Acked/Reviewed/Tested-by since it is
a different patch. End result is the exact same as v3 patch sent yesterday.

 include/trace/events/tcp.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index f51c130f1e0f..c3220d914475 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -43,13 +43,15 @@ TRACE_EVENT(tcp_retransmit_skb,
 		p32 = (__be32 *) __entry->daddr;
 		*p32 =  inet->inet_daddr;
 
-		/* IPv6 socket ? */
-		if (inet6_sk(sk)) {
+#if IS_ENABLED(CONFIG_IPV6)
+		if (sk->sk_family == AF_INET6) {
 			pin6 = (struct in6_addr *)__entry->saddr_v6;
 			*pin6 = sk->sk_v6_rcv_saddr;
 			pin6 = (struct in6_addr *)__entry->daddr_v6;
 			*pin6 = sk->sk_v6_daddr;
-		} else {
+		} else
+#endif
+		{
 			pin6 = (struct in6_addr *)__entry->saddr_v6;
 			ipv6_addr_set_v4mapped(inet->inet_saddr, pin6);
 			pin6 = (struct in6_addr *)__entry->daddr_v6;
-- 
2.1.4